I have been wondering about this, since I just rebuilt my RM250 and want to get the jetting as clean as I can. Two-strokes on YouTube maintained by amateur mechanics smoke quite a bit. I'm curious of opinions.
I measure leanness/richness by looking at the plug, but wondering how much smoke is too much. When I look at pre-2004 Supercross races, I don't seem to see any smoke at all when the bikes are on the line.
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